Cross-polarized antenna

Abstract

A cross-polarized antenna includes a substrate, a first impedance converter, a second impedance converter, a first cross-polarized antenna, and a second cross-polarized antenna. The first cross-polarized antenna has a first opening corresponding to a second opening in the second cross-polarized antenna, in which the two openings cross each other in space without contacting. The antenna is capable of receiving electromagnetic waves from different polarization directions effectively, thereby reducing the polarization loss. Besides, as the antenna is integrally formed, the manufacturing and assembling process thereof are simplified, thus lowering the manufacturing cost.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of Invention[0002]The present invention relates to an antenna, and more particularly to a cross-polarized antenna formed by crossing two integrally formed antennae.[0003]2. Related Art[0004]A radio-frequency (RF) signal output from a radio transmitter is first transmitted to an antenna through a feed-in line, and then radiated outward by the antenna in the form of an electromagnetic wave. When transmitted to a receiving point, the electromagnetic wave is received by another antenna, and the RF signal is then transmitted to a radio receiver through another feed-in line.[0005]Generally, an antenna radiates electromagnetic waves to the outside, and an electromagnetic wave consists of an electric field and a magnetic field, in which the direction of the electric field is a polarization direction of the antenna. Therefore, antennae varied in polarization characteristics receive and radiate different electromagnetic waves due to their different po...

AI Technical Summary

Benefits of technology

[0009]To solve the above problems of polarization loss caused by the difference between the polarization direction of an antenna and that of an electromagnetic wave received by the same, and difficulty in the manufacturing and assembling process of the antenna due to its complicated structure, the present invention is directed to a cross-polarized antenna, which is capable of receiving signals from different polarization directions effectively. Besides, as the antenna is integrally formed, the manufacturing and assembling process thereof are simplified, thus lowering the manufacturing cost.

[0015]The cross-polarized antenna provided by the present invention is capable of receiving signals from different polarization directions effectively, so as to reduce the polarization loss.

[0016]Further, as the first and second cross-polarized antennae of the present invention are integrally formed, the manufacturing process is simple, and each antenna can be assembled by folding various portions perpendicular to the bottom thereof. Therefore, the manufacturing process is simplified, and the cost is thus lowered.

[0017]In view of the above, the problems in the conventional art can be effectively settled by the technical solution of the present invention, so as to reduce the polarization loss and simplify the manufacturing and assembling process.

Problems solved by technology

If an antenna has a polarization direction different from that of a received electromagnetic wave, polarization loss may occur, and the receivable signal becomes smaller.

For example, if a vertically polarized antenna is employed to receive an electromagnetic wave in a horizontal polarization direction, the received signal becomes very small, thus resulting in polarization loss, and the polarization loss at this moment is the greatest.

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